磁场中强阻挫磁体的热力学：三角形Husimi晶格上的Ising反铁磁体
Thermodynamics of strongly frustrated magnet in a field: Ising antiferromagnet on triangular Husimi lattice
摘要：
一些强阻挫磁体，如“自旋冰”化合物，即使在磁场存在下，也不能在有限温度下产生任何磁序。它们仍然具有与场致基态跃迁有关的非常不寻常的低温热力学性质。在这里，我们表明，这种特殊的热力学的一般定性图片可以得到反铁磁伊辛模型的三角形Husimi晶格。该模型的分析结果表明，磁平台，熵尖峰，交叉点和磁化率和比热行为的特殊性，反映了基态跃迁的存在。这些强烈挫败感的特征可能有助于寻找新的挫败磁铁和解释实验数据。
英文摘要：
Some strongly frustrated magnets such as the "spin-ice" compounds fail to produce any magnetic order at finite temperatures even in the presence of magnetic field. Still they have very unusual low-temperature thermodynamic properties related to the field-induced ground state transitions. Here we show that general qualitative picture of such peculiar thermodynamics can be obtained in the antiferromagnetic Ising model on the triangular Husimi lattice. The analytical results for this model show magnetic plateaus, entropy spikes, crossing points and peculiarities in magnetic susceptibility and specific heat behavior reflecting the existence of ground state transitions. These signatures of strong frustration may help in search of new frustrated magnets and in the interpretation of experimental data.
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